| 2019-11-12 13:59:44 |
bugproxy |
bug |
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added bug |
| 2019-11-12 13:59:46 |
bugproxy |
tags |
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architecture-s39064 bugnameltc-182420 severity-high targetmilestone-inin1804 |
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| 2019-11-12 13:59:47 |
bugproxy |
ubuntu: assignee |
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Skipper Bug Screeners (skipper-screen-team) |
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| 2019-11-12 13:59:50 |
bugproxy |
affects |
ubuntu |
linux (Ubuntu) |
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| 2019-11-12 14:09:43 |
Frank Heimes |
bug task added |
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ubuntu-z-systems |
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| 2019-11-12 14:17:29 |
Frank Heimes |
ubuntu-z-systems: importance |
Undecided |
High |
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| 2019-11-12 14:17:34 |
Frank Heimes |
ubuntu-z-systems: status |
New |
Triaged |
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| 2019-11-12 14:35:05 |
Frank Heimes |
ubuntu-z-systems: assignee |
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Frank Heimes (frank-heimes) |
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| 2019-11-12 15:29:49 |
bugproxy |
attachment added |
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reduce the default queue depth and nr of hardware queues https://bugs.launchpad.net/bugs/1852257/+attachment/5304830/+files/0001-s390-dasd-reduce-the-default-queue-depth-and-nr-of-h.patch |
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| 2019-11-12 20:54:56 |
Frank Heimes |
ubuntu-z-systems: status |
Triaged |
Confirmed |
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| 2019-11-14 10:29:52 |
Frank Heimes |
description |
This fix is already available with Ubuntu 18.10, but need also be integrated into Ubuntu 18.04 LTS kernel (4.15).
This is available git-commit:
https://github.com/torvalds/linux/commit/3284da34a87a
Backport information will be provided. |
SRU Justification:
==================
[Impact]
* On s390x systems with a small memory footprint, but large amounts of DASD disks,
* the memory can get depleted (even during installation) which can eventually lead to a situation where the OOM kicks in (followed by even more problems).
* Starting with kernel 4.18 the patch below leads to 90% memory consumption savings per active DASD device.
* The below backport is needed to fix this and get the improvement into bionic's kernel 4.15.
[Fix]
* 3284da34a87ab7a527a593f89bbdaf6debe9e713 3284da3 "s390/dasd: reduce the default queue depth and nr of hardware queues"
* Backport: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1852257/+attachment/5304830/+files/0001-s390-dasd-reduce-the-default-queue-depth-and-nr-of-h.patch
[Test Case]
* Configure a s390x system (z/VM guest or LPAR) with only a bit RAM, but lot's of DASDs devices.
* Now gradually enable more and more DASDs and monitor the memory usage (be sure to exclude shared memory and cache).
* One can notice a difference in mem usage of about 10:1 per activated DASD comparing the current stock 4.15 kernel with a patches kernel 4.15.
* With about less than 1GB memory and 40+ DASD devices one may start to run into an OOM situation w(o the patch.
[Regression Potential]
* The regression potential can be considered as moderate, since:
* this is purely s390x specific
* it again only affects DASD disk storage (no zFCP/SCSI disk storage)
* and it's again only limited to smaller systems (so more z/VM guests rather than LPARs).
[Other Info]
* A cherry-pick to 4.15 wasn't clean (problem in one line), hence the backport, which applied, compiled and worked fine.
__________
This fix is already available with Ubuntu 18.10, but need also be integrated into Ubuntu 18.04 LTS kernel (4.15).
This is available git-commit:
https://github.com/torvalds/linux/commit/3284da34a87a
Backport information will be provided. |
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| 2019-11-14 11:16:39 |
Stefan Bader |
nominated for series |
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Ubuntu Bionic |
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| 2019-11-14 11:16:39 |
Stefan Bader |
bug task added |
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linux (Ubuntu Bionic) |
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| 2019-11-14 11:51:56 |
Frank Heimes |
linux (Ubuntu Bionic): status |
New |
In Progress |
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| 2019-11-14 11:52:02 |
Frank Heimes |
linux (Ubuntu): status |
New |
Fix Released |
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| 2019-11-14 11:52:05 |
Frank Heimes |
ubuntu-z-systems: status |
Confirmed |
In Progress |
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| 2019-11-14 11:57:56 |
Stefan Bader |
linux (Ubuntu Bionic): importance |
Undecided |
High |
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| 2019-12-02 08:16:51 |
Khaled El Mously |
linux (Ubuntu Bionic): status |
In Progress |
Fix Committed |
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| 2019-12-02 08:26:58 |
Frank Heimes |
ubuntu-z-systems: status |
In Progress |
Fix Committed |
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| 2019-12-03 15:44:56 |
Ubuntu Kernel Bot |
tags |
architecture-s39064 bugnameltc-182420 severity-high targetmilestone-inin1804 |
architecture-s39064 bugnameltc-182420 severity-high targetmilestone-inin1804 verification-needed-bionic |
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| 2019-12-05 07:06:13 |
Frank Heimes |
tags |
architecture-s39064 bugnameltc-182420 severity-high targetmilestone-inin1804 verification-needed-bionic |
architecture-s39064 bugnameltc-182420 severity-high targetmilestone-inin1804 verification-done-bionic |
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| 2020-01-06 13:26:17 |
Launchpad Janitor |
linux (Ubuntu Bionic): status |
Fix Committed |
Fix Released |
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| 2020-01-06 13:26:17 |
Launchpad Janitor |
cve linked |
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2019-14895 |
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| 2020-01-06 13:26:17 |
Launchpad Janitor |
cve linked |
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2019-14896 |
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| 2020-01-06 13:26:17 |
Launchpad Janitor |
cve linked |
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2019-14897 |
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| 2020-01-06 13:26:17 |
Launchpad Janitor |
cve linked |
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2019-14901 |
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| 2020-01-06 13:26:17 |
Launchpad Janitor |
cve linked |
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2019-18660 |
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| 2020-01-06 13:26:17 |
Launchpad Janitor |
cve linked |
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2019-19083 |
|
| 2020-01-06 14:03:15 |
Andrew Cloke |
ubuntu-z-systems: status |
Fix Committed |
Fix Released |
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